30 ATR 421 - User manual
9.1 Slave
ATR421-12ABC-T can operate as slave unit setting di s . on parameter 77
rem .s.: this function allows to control multiple controllers connected to a
supervisory system. Each instrument will answer to a Master query only if
contains same address as on parameter 80
sL. ad. Allowed addresses are 1
to 254 and there should not be controllers with the same address on the
same line. Address 255 can be used by the Master to communicate with all
connected devices without knowing their addresses (broadcast mode), whi-
le with address 0 all devices receive command, but no answer is expected.
ATR421 can introduce an answer delay (in milliseconds) to Master request.
This delay has to be set on parameter 81
se.de. At each parameters modi
cation, instrument stores values in EEPROM memory (100000 writing cycles).
NB: Modi cations made to Words di erent from those described in the fol-
lowing table can lead to instrument malfunction.
Here below list of available addresses
RO = Read Only R/W = Read / Write WO = Write Only
Modbus
address
Description
Read
Write
Reset
value
0 Device type RO 210
1 Software version RO FLASH
5 Slave address R/W EEPROM
6 Boot version RO FLASH
50 Automatic addressing WO -
51 Installation code comparison WO -
500
Loading Default values:
9999 restore all values except for cycles
9989 restore all values, cycles included
RW 0
900
AI1 process (degrees with tenths of degree for
temperature sensors; digits for linear sensors).
RO -
901
AI2 process (feedback potentiometer-Ohm/10)
RO -
902 Valve position – 0…100. RO -
1000
Process (degrees with tenths of degree for
temperature sensors; digits for linear sensors).
RO -
1001 Process with decimal point selection. RO -
To Next Page
Loading...
Need help?
General
